Adenoma Detection Rate after Positive Stool-Based Screening in a U.S. Population

Introduction and Objectives Over the past two decades, advancements in screening programs have led to a decrease in the incidence and mortality rates of colorectal cancer. The recommended benchmark for primary screening colonoscopy adenoma detection rate (ADR) is 25%. However, recent research supports higher ADR benchmarks following positive stool testing. Findings from a Dutch screening program have suggested higher ADRs in fecal immunochemical test positive patients with an inverse relationship with interval cancer development. Our study aims to assess ADRs in a U.S. patient population with positive stool screenings and investigate any correlation to occurrences of interval cancers. Materials and Methods Data from all positive stool-based screening participants who subsequently underwent colonoscopy at a tertiary care center between 2017 and 2021 were collected. A retrospective chart review was performed to determine the ADR and interval colon cancers. Results From a total of 120 patients (32 fecal occult blood test [FOBT] positive patients, 43 fecal immunochemical test [FIT] positive patients, 45 FIT-DNA-positive patients), the average ADR was 35%. Nonadvanced polyps were the most identified adenomas at 78.6%. No interval colorectal cancer cases were identified. There was a clear difference in ADR between stool-testing methods, with FIT-DNA showing higher ADRs than FIT and FOBT. Conclusion Endoscopists should recognize the importance of higher ADR targets in colonoscopies conducted after positive stool-based screening as a means to maintain high-quality colonoscopy standards.